Data Sources

How to Download USGS Topo Maps for Free

If you’re looking for topographic maps (contours, place names & hydrography) for the United States, the first place to look is the USGS topo maps series.

global land cover
Data Sources

9 Best Free Land Cover/Land Use Data

Over the span of your life, how much has the Earth changed? Quite a bit, but you probably just can’t put a number to it. You actually CAN with land cover.

Free Satellite Imagery
Data Sources

15 Free Satellite Imagery Data Sources

If you’re searching for free satellite imagery, we rank the best sources of free satellite data from authoritative sources like NASA, USGS and DigitalGlobe.